Fear of Missing Out cannot be blocked and killed by an opponent.
There are four or more card types among cards in your graveyard.
Steps
Declare
Fear of Missing Out as an attacker, choosing to exert it as it attacks and triggering its ability, causing you to untap all other creatures you control and to get an additional combat phase after this one.
Deal combat damage to an opponent using
Fear of Missing Out, triggering
Impostor Syndrome, creating a token copy of
Fear of Missing Out that isn't legendary.
During your next combat phase, declare
Fear of Missing Out and the
Fear of Missing Out token as attackers, choosing to exert the
Fear of Missing Out token as it attacks.
The
Fear of Missing Out token triggers, causing you to untap all other creatures you control and to get an additional combat phase after this one.